Exterior surface configuration for a fuel tank



FIG. 1 is a top perspective view of an exterior surface configurationfor a fuel tank showing my new design.

FIG. 2 is a bottom perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a left side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The even dash-dash broken lines in the drawings illustrate portions ofthe exterior surface configuration for a fuel tank that form no part ofthe claimed design.

CLAIM The ornamental design for an exterior surface configuration for afuel tank, as shown and described.